US20230104232A1 - Method for inspecting welding quality of welded portion between electrode tab and lead - Google Patents
Method for inspecting welding quality of welded portion between electrode tab and lead Download PDFInfo
- Publication number
- US20230104232A1 US20230104232A1 US17/801,107 US202117801107A US2023104232A1 US 20230104232 A1 US20230104232 A1 US 20230104232A1 US 202117801107 A US202117801107 A US 202117801107A US 2023104232 A1 US2023104232 A1 US 2023104232A1
- Authority
- US
- United States
- Prior art keywords
- welding
- welded
- welded portion
- measuring
- traces
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 137
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000007689 inspection Methods 0.000 claims abstract description 47
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 7
- -1 aluminum-cadmium Chemical compound 0.000 description 6
- 230000001066 destructive effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000004020 conductor Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 239000007774 positive electrode material Substances 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910052723 transition metal Inorganic materials 0.000 description 4
- 150000003624 transition metals Chemical class 0.000 description 4
- 239000011149 active material Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000004745 nonwoven fabric Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000011267 electrode slurry Substances 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 230000004446 light reflex Effects 0.000 description 2
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 2
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229910000925 Cd alloy Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 229910007969 Li-Co-Ni Inorganic materials 0.000 description 1
- 229910007177 Li1+zNi0.4Mn0.4Co0.2O2 Inorganic materials 0.000 description 1
- 229910007180 Li1+zNi1/3Co1/3Mn1/3O2 Inorganic materials 0.000 description 1
- 229910014383 LiNi1-yMyO2 Inorganic materials 0.000 description 1
- 229910014952 LiNi1−yMyO2 Inorganic materials 0.000 description 1
- 229910016622 LixFe2O3 Inorganic materials 0.000 description 1
- 229910015103 LixWO2 Inorganic materials 0.000 description 1
- 229910006555 Li—Co—Ni Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 229920000265 Polyparaphenylene Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- SOXUFMZTHZXOGC-UHFFFAOYSA-N [Li].[Mn].[Co].[Ni] Chemical compound [Li].[Mn].[Co].[Ni] SOXUFMZTHZXOGC-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- LJCFOYOSGPHIOO-UHFFFAOYSA-N antimony pentoxide Inorganic materials O=[Sb](=O)O[Sb](=O)=O LJCFOYOSGPHIOO-UHFFFAOYSA-N 0.000 description 1
- 229910000411 antimony tetroxide Inorganic materials 0.000 description 1
- GHPGOEFPKIHBNM-UHFFFAOYSA-N antimony(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Sb+3].[Sb+3] GHPGOEFPKIHBNM-UHFFFAOYSA-N 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 229910000417 bismuth pentoxide Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000006231 channel black Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000006232 furnace black Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N germanium monoxide Inorganic materials [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 description 1
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 239000006233 lamp black Substances 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- YADSGOSSYOOKMP-UHFFFAOYSA-N lead dioxide Inorganic materials O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- XMFOQHDPRMAJNU-UHFFFAOYSA-N lead(II,IV) oxide Inorganic materials O1[Pb]O[Pb]11O[Pb]O1 XMFOQHDPRMAJNU-UHFFFAOYSA-N 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 229910021437 lithium-transition metal oxide Inorganic materials 0.000 description 1
- VROAXDSNYPAOBJ-UHFFFAOYSA-N lithium;oxido(oxo)nickel Chemical group [Li+].[O-][Ni]=O VROAXDSNYPAOBJ-UHFFFAOYSA-N 0.000 description 1
- VLXXBCXTUVRROQ-UHFFFAOYSA-N lithium;oxido-oxo-(oxomanganiooxy)manganese Chemical group [Li+].[O-][Mn](=O)O[Mn]=O VLXXBCXTUVRROQ-UHFFFAOYSA-N 0.000 description 1
- URIIGZKXFBNRAU-UHFFFAOYSA-N lithium;oxonickel Chemical group [Li].[Ni]=O URIIGZKXFBNRAU-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000010450 olivine Substances 0.000 description 1
- 229910052609 olivine Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920001197 polyacetylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000004627 regenerated cellulose Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 229920005608 sulfonated EPDM Polymers 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- QHGNHLZPVBIIPX-UHFFFAOYSA-N tin(II) oxide Inorganic materials [Sn]=O QHGNHLZPVBIIPX-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 235000015041 whisky Nutrition 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0037—Measuring of dimensions of welds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/28—Measuring arrangements characterised by the use of optical techniques for measuring areas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/207—Welded or soldered joints; Solderability
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
- G06T7/0006—Industrial image inspection using a design-rule based approach
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/38—Conductors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8854—Grading and classifying of flaws
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
- G06T2207/30152—Solder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a method of inspecting a welding quality for determining a welded portion of an electrode tab and an electrode lead has been weakly welded, excessively welded or normally welded.
- lithium secondary batteries which exhibit a high energy density and operational potential, a long cycle life, and a low self-discharge rate have been commercialized and widely used.
- the lithium secondary battery has a structure where a non-aqueous electrolyte containing a lithium salt is impregnated in an electrode assembly in which a porous separator is interposed between a positive electrode and a negative electrode where an active material has been applied on a current collector.
- Such a lithium secondary battery may be classified into a can-type secondary battery in which the cell assembly is embedded in a metal can, and a pouch-type secondary battery in which the cell assembly is embedded in a pouch case of an aluminum laminate sheet, depending on the shape of the exterior material case.
- Pouch-type lithium secondary batteries are drawing attention as the power source of electric vehicles or hybrid vehicles due to a low price, a high energy density, and advantage that it is easy to form a large capacity battery pack through serial or parallel connection.
- a pouch-type lithium secondary battery has a structure in which a cell assembly, to which a plate-type electrode lead is connected, is sealed together with an electrolyte solution in a pouch case. A part of the electrode lead is exposed to the outside of the pouch case, and the exposed electrode lead is electrically connected to a device where a secondary battery is mounted or is used to electrically connect secondary batteries.
- the pouch-type lithium secondary battery includes an electrode assembly, a plurality of electrode tabs extending from the electrode assembly, electrode leads welded to the electrode tabs, and a pouch-type exterior material accommodating the electrode assembly.
- Such electrode tabs are extended from each electrode plate of the electrode assembly, the electrode leads are electrically connected to the plurality of electrode tabs extended from respective electrode plates and are coupled in a form that is partly exposed to the outside of the pouch case.
- the ultrasonic welding is a scheme which generates ultrasonic vibrations of 10 to 75 kHz and welds metal through ultrasonic vibration friction heat between metals. Namely, if ultrasonic vibration is applied by the ultrasonic welding device in a state that the electrode tab contacts the electrode lead, friction heat is generated on the contact surface between the electrode tab and the electrode lead, and the electrode tab and the electrode lead are welded by the generated friction heat.
- the welding quality of the electrode tab-electrode lead welded portion was checked by measuring the tensile strength by pulling the electrode tab and the electrode lead by a gripper, respectively, but since this is a destructive inspection method, total inspection is impossible, and the welding quality can be checked by only an intermittent sample test.
- Korean Patent No. 10-1678662 discloses a technology for determining the welding quality by measuring welding points of an inspection area by vision and comparing the sum of the welding points with the welding strength.
- the inspection area is limited to some pressure points in the above-described technology, reliability decreases.
- a non-destructive inspection method capable of improving reliability of inspection in inspecting the welding quality of the electrode tab-electrode lead welded portion.
- the present invention has been made to solve the above problems, and an object of the present invention is to provide a method of inspecting a welding quality of an electrode tab-electrode lead welded portion of a pouch-type lithium secondary battery in a non-destructive manner.
- an object of the present invention is to provide an inspection method capable of determining the welding quality in a simplified method.
- a method of inspecting a welding quality includes: recognizing welding traces of the welded portion by a vision inspection device; measuring a size of each of the recognized welding traces; and determining whether the welded portion has been weakly welded, excessively welded or normally welded by comparing the measured size with a reference value.
- the measuring includes measuring a diagonal length of each of the welding traces.
- the welded portion may be welded by an ultrasonic welding or laser welding method.
- the recognizing may include vision-inspecting an electrode lead surface of the welded portion.
- the measuring may include measuring an area of each of the welding traces.
- the reference value may be obtained from welding quality correlation data according to a pitch of a welding horn.
- the determining may include determining that the welded portion has been weakly welded if an average value of sizes of the welding traces is smaller than the reference value and determining that the welded portion has been excessively welded if the average value is greater than the reference value.
- the measuring may include measuring sizes remaining pressure points except for pressure points existing on a first line of each of an upper side, a lower side, a left side and a right side of the welded portion.
- the method includes inspecting a tensile strength of an object determined as having been normally welded during the determining.
- the welding quality can be measured in a simple method.
- the boundary of the welded portion can be clearly recognized, and the welding quality inspection can be more accurately performed.
- FIG. 1 is a flowchart illustrating the order of a method of inspecting a welding quality according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram showing a vision inspection process according to an embodiment of the present invention.
- FIG. 3 is a conceptual diagram showing sizes of welding traces.
- FIG. 4 is a flowchart illustrating the order of a method of inspecting a welding quality according to another embodiment of the present invention.
- FIGS. 5 to 7 are diagrams showing the results of vision-measuring sizes of welding traces according to an embodiment of the present invention.
- FIG. 1 is a flowchart illustrating the order of a method of inspecting a welding quality according to an embodiment of the present invention.
- a method of inspecting a welding quality of the present invention is a method for inspecting a welding quality of an electrode tab-electrode lead welded portion of a pouch-type lithium secondary battery, and the method includes: recognizing welding traces of the welded portion by a vision inspection device (S 10 ); measuring a size of each of the recognized welding traces (S 20 ); and determining whether the welded portion has been weakly welded, excessively welded or normally welded by comparing the measured size with a reference value (S 30 ).
- the inventors of the present invention have devised the present invention of measuring the welding quality by measuring the size of the welding trace of the welded portion in view of the fact that the larger the welding strength of the welded portion, the larger the welding trace.
- the welding trace in the present invention is a concept including welding pressure points in the case of an ultrasonic welding method and welding beads in the case of a laser welding method.
- the vision inspection step (S 10 ) includes recognizing welding traces of the welded portion, where the electrode tab and the electrode lead have been welded, by a vision inspection device.
- the vision inspection device may be a microscope or an imaging camera.
- FIG. 2 is a schematic diagram showing a vision inspection process for an ultrasonic welding portion according to an embodiment of the present invention.
- a vision inspection unit 210 may photograph or scan the welded portion and transmit image data or image files to a data input unit 220 .
- the data input unit 220 may transmit data such as images, which are received from the vision inspection unit 210 , to a measuring unit 230 , and the measuring unit 230 may measure lengths of diagonal lines of pressure points from images, which are received form the data input unit 220 , and/or areas of the pressure points, and transmit the measurement result information to a data storage unit (not shown), a display unit 250 , or a determination unit 240 .
- the determination unit 240 compares the lengths of diagonal lines of pressure points, which represent the sizes of the pressure points received from the measuring unit 230 , and/or the areas of the pressure points, with the reference value, which becomes the basis for determining whether there is a welding defect, to thereby determine whether the welded portion has been weakly welded, excessively welded or normally welded.
- the inspection method of the present invention is characterized in performing vision inspection for the lead surface of the welded portion in the vision inspection step.
- the welding is performed in a state that the electrode tab is located under the electrode lead unlike the ultrasonic welding.
- the vision inspection unit vision-inspects the upper surface which is the electrode lead surface of the electrode lead welded portion.
- the sizes of the welding traces are measured from the image of the welded portion obtained by the vision inspection.
- the size of the pressure point may be the length of the diagonal line of the welding trace.
- FIG. 3 is a conceptual diagram showing sizes of welding traces. Referring to FIG. 3 , the welded portion includes a plurality of welding traces, and one welding trace has a form of rhombus. The size of the welding trace in a rhombus shape may be estimated by the length of the diagonal line (a, b) which is the distance between two vertexes facing each other.
- the size of the welding trace may be estimated by measuring the area of the welding trace.
- There may be various methods of measuring the area of the welding trace but in one preferred example, a method of measuring an image in pixel units may be used. By recognizing the number of pixels corresponding to the area occupied by the welding trace in the image, automation is possible, and uniform measurement criteria may be applied.
- the measuring step may be to measure the sizes of remaining pressure points except for pressure points existing on each first line of an upper side, a lower side, a left side and a right side of the welded portion in the image obtained at the vision inspection step.
- FIGS. 6 and 7 illustrate an image of a welded portion obtained from a vision inspection unit according to an embodiment of the present invention.
- FIG. 6 shows an image of a lead surface in a welded portion of a positive electrode tab and a lead
- FIG. 7 shows an image of a lead surface in a welded portion of a negative electrode tab and a lead.
- the measuring unit may measure the area and the length of the diagonal line (width, height) for a plurality of welding traces from the image and display their measurement values. Further, the sizes of all welding traces in the inspection area may be measured, but pressure points existing on each first line of an upper side, a lower side, a left side and a right side are not measured. Referring to FIG.
- sizes of pressure points existing on the first line of the upper portion are significantly smaller than sizes of other pressure points.
- sizes of pressure points existing on the first line of the inspection area are significantly smaller than sizes of other pressure points.
- the determining step (S 30 ) is a step of determining whether there is a welding defect in the welded portion by comparing the area and the length of the diagonal line of the welding trace measured in the measuring step (S 20 ) with the reference value.
- the determining step includes a process of setting a numerical value range of the sizes of welding traces, which satisfy normal welding requirements, to a reference value, based on welding quality result data according to sizes of welding traces in advance, and determining that the welded portion has been weakly welded if the numerical range is below the preset reference value, determining that the welded portion has been excessively welded if the numerical range is above the reference value, and determining that the welded portion has been normally welded if the numerical range corresponds to the reference value.
- the reference value may be obtained from welding quality correlation data according to a pitch of a welding horn.
- the welding horn refers to a member included in an ultrasonic welding device.
- the ultrasonic welding is to join objects by ultrasonic vibrations in a state that a welded object is inserted between horn and anvil welding bodies.
- the welding conditions may be determined by adjusting the pitch of the horn.
- the reference value may be set based on the horn pitch.
- FIG. 5 shows the result of setting a reference value according to the pitch of a horn and determining the welding quality according to the set reference value, according to an embodiment of the present invention.
- the reference value of the normal welding is in the range of 0.889 to 1.016 mm.
- the size of the welding trace is below the above numerical value range, it is determined as a weak welding, and when the size is above the above numerical value range, it is determined as an excessive welding.
- Even when the horn pitch is 1.2 mm it is possible to determine whether the welding corresponds to a weak welding, an excessive welding or a normal welding, by setting a reference value.
- the method of determining the welding quality by comparing lengths of diagonal lines of welding traces is simpler than the method of determining the welding quality by comparing welded areas.
- FIG. 5 shows an example of determining whether there is a welding defect by measuring lengths of diagonal lines of welding traces, but it is also possible to determine whether there is a welding defect by measuring areas occupied by the welding traces.
- the welding quality can be determined by measuring the areas and lengths of respective diagonal lines of the welding traces, calculating the average value of the measured values, and comparing the average value with the reference value.
- FIG. 4 is a flowchart illustrating the order of a method of inspecting a welding quality according to another embodiment of the present invention.
- the welding strength is estimated form the size of the welding trace, and thus the welding may be regarded as a normal welding even when it actually is a weak welding.
- a tensile strength inspection is additionally performed.
- the tensile strength inspection is a destructive inspection in which the welded portion is broken, it is not possible to perform inspection for all objects which are determined as being normal, and the inspection is intermittently performed for a few objects. Since the inspection method of the present invention includes the above-described non-destructive inspection for all battery cells, it can supplement intermittent tensile strength inspection.
- the battery which is inspected by the inspection method of the present invention, may have a structure in which an electrode assembly having a structure, where a positive electrode, a separator, and a negative electrode are alternately stacked, is accommodated in a battery case.
- the positive electrode and the negative electrode each have a structure where an electrode slurry containing an electrode active material is applied on a current collector, which was then dried and rolled to thereby form an active material layer.
- an electrolyte solution may be injected into the inside and be sealed to thereby manufacture a battery cell.
- the current collector may be a positive electrode current collector or a negative electrode current collector
- the electrode active material may be a positive electrode active material or a negative electrode active material
- the electrode slurry may further include a conductive material and a binder in addition to the electrode active material.
- the positive electrode collector generally has a thickness of 3 to 500 micrometers.
- the positive electrode current collector is not particularly limited as long as it has high conductivity without causing a chemical change in the battery.
- Examples of the positive electrode current collector include stainless steel, aluminum, nickel, titanium, sintered carbon or aluminum or stainless steel of which the surface has been treated with carbon, nickel, titanium, silver, or the like.
- the current collector may have fine irregularities on the surface thereof to increase the adhesion of the positive electrode active material, and various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric are possible.
- the sheet for the negative electrode collector generally has a thickness of 3 to 500 micrometers.
- the negative electrode current collector is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, and examples thereof include copper, stainless steel, aluminum, nickel, titanium, sintered carbon, copper or stainless steel of which the surface has been treated with carbon, nickel, titanium, silver or the like, aluminum-cadmium alloy, or the like.
- fine unevenness can be formed on the surface to enhance the bonding force of the negative electrode active material, and it can be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.
- the positive electrode active material is a material capable of causing an electrochemical reaction and a lithium transition metal oxide, and contains two or more transition metals.
- the negative electrode active material examples include carbon such as non-graphitized carbon and graphite carbon; metal complex oxide such as Li x Fe 2 O 3 (0 ⁇ x ⁇ 1), Li x WO 2 (0 ⁇ x ⁇ 1), Sn x Me 1-x Me′ y O z (Me: Mn, Fe, Pb, Ge; Me′: Al, B, P, Si, groups 1 , 2 , and 3 of the periodic table, halogen; 0 ⁇ x ⁇ 1; 1 ⁇ y ⁇ 3; 1 ⁇ z ⁇ 8); lithium metal; lithium alloy; silicon alloy; tin alloy; metal oxides such as SnO, SnO 2 , PbO, PbO 2 , Pb 2 O 3 , Pb 3 O 4 , Sb 2 O 3 , Sb 2 O 4 , Sb 2 O 5 , GeO, GeO 2 , Bi 2 O 3 , Bi 2 O 4 , and Bi 2 O 5 ; conductive polymers such as polyacetylene; and Li—Co—Ni-based materials.
- the conductive material is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture including the positive electrode active material.
- a conductive material is not particularly limited as long as it has electrical conductivity without causing a chemical change in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; carbon black such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; conductive fibers such as carbon fiber and metal fiber; metal powders such as carbon fluoride, aluminum and nickel powder; conductive whiskey such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; and conductive materials such as polyphenylene derivatives and the like.
- the binder is added in an amount of 1 to 30% by weight, on the basis of the total weight of the mixture containing the positive electrode active material, as a component that assists in bonding between the active material and the conductive material and bonding to the current collector.
- binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.
- the separator is interposed between the positive electrode and the negative electrode, and an insulating thin film having high ion permeability and mechanical strength is used.
- the pore diameter of the separator is generally 0.01 to 10 micrometers, and the thickness is generally 5 to 300 micrometers.
- Examples of such a separator include olefin-based polymers such as polypropylene which is chemically resistant and hydrophobic; a sheet or a nonwoven fabric made of glass fiber, polyethylene or the like.
- an electrode tab is formed at one side of an electrode, and the electrode tab may be a positive electrode tab or a negative electrode tab.
- a positive electrode lead and a negative electrode lead are connected to the positive electrode tab and the negative electrode tab, respectively.
- the positive electrode lead and the negative electrode lead are drawn to the outside to thereby play a role of a terminal which is electrically connected to the outside.
- the positive electrode lead and the negative electrode lead may be joined to the positive electrode tab and the negative electrode tab, respectively, by welding.
- the battery case is not particularly limited as long as it is used as an exterior material for packaging the battery, and a cylindrical, square, or pouch type may be used and specifically a pouch-type battery case may be used.
- the pouch-type battery case is generally made of an aluminum laminate sheet and may be composed of an inner sealant layer for sealing, a metal layer for preventing permeation of materials, and an external resin layer forming the outermost part of the case. Details of the battery case are known to those of ordinary skill in the art, and thus detailed description thereof will be omitted.
- an electrode tab is drawn out to one side for electric connection with an external device or another battery cell.
- the electrode tab may be a positive electrode tab or a negative electrode tab, and the positive electrode tab and the negative electrode tab may be coupled by the welding with the electrode lead.
- the electrode lead is drawn to the outside of the battery case.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Mechanical Engineering (AREA)
- Quality & Reliability (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Theoretical Computer Science (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The present invention relates to a method for inspecting a welding quality of an electrode tab-electrode lead welded portion of a pouch-type lithium secondary battery, and the method includes: recognizing welding traces of the welded portion by a vision inspection device; measuring a size of each of the recognized welding traces; and determining whether the welded portion has been weakly welded, excessively welded or normally welded by comparing the measured size with a reference value.
Description
- This application claims the benefit of priority based on Korean Patent Application No. 10-2020-0116258, filed on Sep. 10, 2020, and the entire contents of the Korean patent application are incorporated herein by reference.
- The present invention relates to a method of inspecting a welding quality for determining a welded portion of an electrode tab and an electrode lead has been weakly welded, excessively welded or normally welded.
- As technologies for mobile devices are developed and demand for the mobile devices increases, there has been a rapid increase in demand for secondary batteries as energy sources. Among such secondary batteries, lithium secondary batteries, which exhibit a high energy density and operational potential, a long cycle life, and a low self-discharge rate have been commercialized and widely used.
- The lithium secondary battery has a structure where a non-aqueous electrolyte containing a lithium salt is impregnated in an electrode assembly in which a porous separator is interposed between a positive electrode and a negative electrode where an active material has been applied on a current collector.
- Such a lithium secondary battery may be classified into a can-type secondary battery in which the cell assembly is embedded in a metal can, and a pouch-type secondary battery in which the cell assembly is embedded in a pouch case of an aluminum laminate sheet, depending on the shape of the exterior material case.
- Pouch-type lithium secondary batteries are drawing attention as the power source of electric vehicles or hybrid vehicles due to a low price, a high energy density, and advantage that it is easy to form a large capacity battery pack through serial or parallel connection. Such a pouch-type lithium secondary battery has a structure in which a cell assembly, to which a plate-type electrode lead is connected, is sealed together with an electrolyte solution in a pouch case. A part of the electrode lead is exposed to the outside of the pouch case, and the exposed electrode lead is electrically connected to a device where a secondary battery is mounted or is used to electrically connect secondary batteries.
- The pouch-type lithium secondary battery includes an electrode assembly, a plurality of electrode tabs extending from the electrode assembly, electrode leads welded to the electrode tabs, and a pouch-type exterior material accommodating the electrode assembly.
- Such electrode tabs are extended from each electrode plate of the electrode assembly, the electrode leads are electrically connected to the plurality of electrode tabs extended from respective electrode plates and are coupled in a form that is partly exposed to the outside of the pouch case.
- When the electrode tab and the electrode lead are welded, laser welding, resistance welding and ultrasonic welding may be used. Herein, the ultrasonic welding is a scheme which generates ultrasonic vibrations of 10 to 75 kHz and welds metal through ultrasonic vibration friction heat between metals. Namely, if ultrasonic vibration is applied by the ultrasonic welding device in a state that the electrode tab contacts the electrode lead, friction heat is generated on the contact surface between the electrode tab and the electrode lead, and the electrode tab and the electrode lead are welded by the generated friction heat.
- The welding quality of the electrode tab-electrode lead welded portion was checked by measuring the tensile strength by pulling the electrode tab and the electrode lead by a gripper, respectively, but since this is a destructive inspection method, total inspection is impossible, and the welding quality can be checked by only an intermittent sample test.
- Korean Patent No. 10-1678662 discloses a technology for determining the welding quality by measuring welding points of an inspection area by vision and comparing the sum of the welding points with the welding strength. However, since the inspection area is limited to some pressure points in the above-described technology, reliability decreases. Hence, there is a need for development of a technology about a non-destructive inspection method capable of improving reliability of inspection in inspecting the welding quality of the electrode tab-electrode lead welded portion.
- The present invention has been made to solve the above problems, and an object of the present invention is to provide a method of inspecting a welding quality of an electrode tab-electrode lead welded portion of a pouch-type lithium secondary battery in a non-destructive manner.
- Further, an object of the present invention is to provide an inspection method capable of determining the welding quality in a simplified method.
- A method of inspecting a welding quality according to an embodiment of the present invention includes: recognizing welding traces of the welded portion by a vision inspection device; measuring a size of each of the recognized welding traces; and determining whether the welded portion has been weakly welded, excessively welded or normally welded by comparing the measured size with a reference value.
- In an embodiment of the present invention, the measuring includes measuring a diagonal length of each of the welding traces.
- In an embodiment of the present invention, the welded portion may be welded by an ultrasonic welding or laser welding method.
- In an embodiment of the present invention, the recognizing may include vision-inspecting an electrode lead surface of the welded portion.
- In an embodiment of the present invention, the measuring may include measuring an area of each of the welding traces.
- In an embodiment of the present invention, the reference value may be obtained from welding quality correlation data according to a pitch of a welding horn.
- In an embodiment of the present invention, the determining may include determining that the welded portion has been weakly welded if an average value of sizes of the welding traces is smaller than the reference value and determining that the welded portion has been excessively welded if the average value is greater than the reference value.
- In an embodiment of the present invention, the measuring may include measuring sizes remaining pressure points except for pressure points existing on a first line of each of an upper side, a lower side, a left side and a right side of the welded portion.
- In an embodiment of the present invention, the method includes inspecting a tensile strength of an object determined as having been normally welded during the determining.
- According to the present invention, since a welding quality is measured by comparing the measurement value of the length of the diagonal line of the welding trace of the welded portion with the reference value, the welding quality can be measured in a simple method.
- According to the present invention, since the lead surface of the welded portion is vision-inspected, the boundary of the welded portion can be clearly recognized, and the welding quality inspection can be more accurately performed.
-
FIG. 1 is a flowchart illustrating the order of a method of inspecting a welding quality according to an embodiment of the present invention. -
FIG. 2 is a schematic diagram showing a vision inspection process according to an embodiment of the present invention. -
FIG. 3 is a conceptual diagram showing sizes of welding traces. -
FIG. 4 is a flowchart illustrating the order of a method of inspecting a welding quality according to another embodiment of the present invention. -
FIGS. 5 to 7 are diagrams showing the results of vision-measuring sizes of welding traces according to an embodiment of the present invention. - Hereinafter, the present invention will be described in detail with reference to the drawings. The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may properly define the concept of the terms in order to best describe its invention. The terms and words should be construed as meaning and concept consistent with the technical idea of the present invention.
- In this application, it should be understood that terms such as “include” or “have” are intended to indicate that there is a feature, number, step, operation, component, part, or a combination thereof described on the specification, and they do not exclude in advance the possibility of the presence or addition of one or more other features or numbers, steps, operations, components, parts or combinations thereof. Also, when a portion such as a layer, a film, an area, a plate, etc. is referred to as being “on” another portion, this includes not only the case where the portion is “directly on” the another portion but also the case where further another portion is interposed therebetween. On the other hand, when a portion such as a layer, a film, an area, a plate, etc. is referred to as being “under” another portion, this includes not only the case where the portion is “directly under” the another portion but also the case where further another portion is interposed therebetween. In addition, to be disposed “on” in the present application may include the case disposed at the bottom as well as the top.
- Hereinafter, the present invention will be described in detail with reference to the drawings.
-
FIG. 1 is a flowchart illustrating the order of a method of inspecting a welding quality according to an embodiment of the present invention. Referring toFIG. 1 , a method of inspecting a welding quality of the present invention is a method for inspecting a welding quality of an electrode tab-electrode lead welded portion of a pouch-type lithium secondary battery, and the method includes: recognizing welding traces of the welded portion by a vision inspection device (S10); measuring a size of each of the recognized welding traces (S20); and determining whether the welded portion has been weakly welded, excessively welded or normally welded by comparing the measured size with a reference value (S30). - The inventors of the present invention have devised the present invention of measuring the welding quality by measuring the size of the welding trace of the welded portion in view of the fact that the larger the welding strength of the welded portion, the larger the welding trace.
- The welding trace in the present invention is a concept including welding pressure points in the case of an ultrasonic welding method and welding beads in the case of a laser welding method.
- In the conventional welding quality inspection method, only the tensile strength was measured by pulling the electrode tab and the electrode lead by a gripper, respectively. However, since the battery is broken in this method, only intermittent inspection like a sample test was performed. However, according to the welding quality inspection method of the present invention, welding traces of the welded portion are vision-inspected, and the sizes of the welding traces recognized in the vision inspection are measured to thereby determine the welding quality. In this case, since the battery is not broken at the time of the welding quality inspection, all batteries can be inspected.
- The vision inspection step (S10) includes recognizing welding traces of the welded portion, where the electrode tab and the electrode lead have been welded, by a vision inspection device. The vision inspection device may be a microscope or an imaging camera.
-
FIG. 2 is a schematic diagram showing a vision inspection process for an ultrasonic welding portion according to an embodiment of the present invention. Referring toFIG. 2 , avision inspection unit 210 may photograph or scan the welded portion and transmit image data or image files to adata input unit 220. Thedata input unit 220 may transmit data such as images, which are received from thevision inspection unit 210, to ameasuring unit 230, and themeasuring unit 230 may measure lengths of diagonal lines of pressure points from images, which are received form thedata input unit 220, and/or areas of the pressure points, and transmit the measurement result information to a data storage unit (not shown), adisplay unit 250, or adetermination unit 240. Further, thedetermination unit 240 compares the lengths of diagonal lines of pressure points, which represent the sizes of the pressure points received from themeasuring unit 230, and/or the areas of the pressure points, with the reference value, which becomes the basis for determining whether there is a welding defect, to thereby determine whether the welded portion has been weakly welded, excessively welded or normally welded. - Referring to
FIG. 2 , in the case of ultrasonic welding, welding is performed in a state that anelectrode tab 120 is positioned on the upper portion of an electrode lead, and thevision inspection unit 210 vision-inspect the back surface, which is the electrode lead surface, among the top surface and the back surface of the welded portion of the electrode tab 100 and theelectrode lead 110. This is because the upper surface of the welded portion is an electrode tab surface, and the electrode tab is made of an electrode current collector foil, and thus the boundary of the welding trace is not clearly recognized at the time of vision inspection due to light reflex. On the contrary, the lead surface, which is the lower surface of the welded portion, does not have a problem that the boundary becomes unclear due to light reflex. As such, the inspection method of the present invention is characterized in performing vision inspection for the lead surface of the welded portion in the vision inspection step. - Further, in the case of the laser welding, the welding is performed in a state that the electrode tab is located under the electrode lead unlike the ultrasonic welding. As such, in this case, the vision inspection unit vision-inspects the upper surface which is the electrode lead surface of the electrode lead welded portion.
- In the measuring step (S20), the sizes of the welding traces are measured from the image of the welded portion obtained by the vision inspection. In one specific example, the size of the pressure point may be the length of the diagonal line of the welding trace.
FIG. 3 is a conceptual diagram showing sizes of welding traces. Referring toFIG. 3 , the welded portion includes a plurality of welding traces, and one welding trace has a form of rhombus. The size of the welding trace in a rhombus shape may be estimated by the length of the diagonal line (a, b) which is the distance between two vertexes facing each other. - In one specific example, the size of the welding trace may be estimated by measuring the area of the welding trace. There may be various methods of measuring the area of the welding trace, but in one preferred example, a method of measuring an image in pixel units may be used. By recognizing the number of pixels corresponding to the area occupied by the welding trace in the image, automation is possible, and uniform measurement criteria may be applied.
- In one specific example, the measuring step may be to measure the sizes of remaining pressure points except for pressure points existing on each first line of an upper side, a lower side, a left side and a right side of the welded portion in the image obtained at the vision inspection step.
-
FIGS. 6 and 7 illustrate an image of a welded portion obtained from a vision inspection unit according to an embodiment of the present invention.FIG. 6 shows an image of a lead surface in a welded portion of a positive electrode tab and a lead, andFIG. 7 shows an image of a lead surface in a welded portion of a negative electrode tab and a lead. The measuring unit may measure the area and the length of the diagonal line (width, height) for a plurality of welding traces from the image and display their measurement values. Further, the sizes of all welding traces in the inspection area may be measured, but pressure points existing on each first line of an upper side, a lower side, a left side and a right side are not measured. Referring toFIG. 6 , sizes of pressure points existing on the first line of the upper portion are significantly smaller than sizes of other pressure points. Referring toFIG. 7 , the sizes of pressure points existing on the first line of the inspection area are significantly smaller than sizes of other pressure points. Hence, since these welding traces become a noise, they are excluded at the time of the welding quality inspection. - The determining step (S30) is a step of determining whether there is a welding defect in the welded portion by comparing the area and the length of the diagonal line of the welding trace measured in the measuring step (S20) with the reference value. The determining step includes a process of setting a numerical value range of the sizes of welding traces, which satisfy normal welding requirements, to a reference value, based on welding quality result data according to sizes of welding traces in advance, and determining that the welded portion has been weakly welded if the numerical range is below the preset reference value, determining that the welded portion has been excessively welded if the numerical range is above the reference value, and determining that the welded portion has been normally welded if the numerical range corresponds to the reference value.
- In one specific example, the reference value may be obtained from welding quality correlation data according to a pitch of a welding horn. Herein, the welding horn refers to a member included in an ultrasonic welding device. The ultrasonic welding is to join objects by ultrasonic vibrations in a state that a welded object is inserted between horn and anvil welding bodies. At this time, the welding conditions may be determined by adjusting the pitch of the horn. In one preferred example, the reference value may be set based on the horn pitch.
- The length of the horn pitch is the length of one side in the welding trace of a rhombus form, and when assuming that the lengths of 4 sides are the same, the length of the diagonal line is 1.27 mm (=0.9*√{square root over (2)}) when the pitch of the horn is 0.9 mm. Namely, based on 1.27 mm, which is the length of the diagonal line of the welding horn having the pitch of 0.9 mm, the numerical range (=0.889 mm to 1.016 mm) corresponding to 70 to 80% of the length may be set to the reference value.
-
FIG. 5 shows the result of setting a reference value according to the pitch of a horn and determining the welding quality according to the set reference value, according to an embodiment of the present invention. When the horn pitch is 0.9 mm, the reference value of the normal welding is in the range of 0.889 to 1.016 mm. Hence, when the size of the welding trace is below the above numerical value range, it is determined as a weak welding, and when the size is above the above numerical value range, it is determined as an excessive welding. Even when the horn pitch is 1.2 mm, it is possible to determine whether the welding corresponds to a weak welding, an excessive welding or a normal welding, by setting a reference value. - The method of determining the welding quality by comparing lengths of diagonal lines of welding traces is simpler than the method of determining the welding quality by comparing welded areas.
-
FIG. 5 shows an example of determining whether there is a welding defect by measuring lengths of diagonal lines of welding traces, but it is also possible to determine whether there is a welding defect by measuring areas occupied by the welding traces. - Further, there are a plurality of welding traces, and the areas and lengths of respective diagonal lines of the welding traces are different. Hence, the welding quality can be determined by measuring the areas and lengths of respective diagonal lines of the welding traces, calculating the average value of the measured values, and comparing the average value with the reference value.
-
FIG. 4 is a flowchart illustrating the order of a method of inspecting a welding quality according to another embodiment of the present invention. Referring toFIG. 4 , it is possible to include a process of additionally performing a tensile strength inspection for an object, which is determined as having been normally welded, after performing the above-described non-destructive welding quality inspection method. In the case of the method of determining the welding quality by vision-measuring the size of the welding trace, the welding strength is estimated form the size of the welding trace, and thus the welding may be regarded as a normal welding even when it actually is a weak welding. As such, a tensile strength inspection is additionally performed. Since the tensile strength inspection is a destructive inspection in which the welded portion is broken, it is not possible to perform inspection for all objects which are determined as being normal, and the inspection is intermittently performed for a few objects. Since the inspection method of the present invention includes the above-described non-destructive inspection for all battery cells, it can supplement intermittent tensile strength inspection. - Further, the battery, which is inspected by the inspection method of the present invention, may have a structure in which an electrode assembly having a structure, where a positive electrode, a separator, and a negative electrode are alternately stacked, is accommodated in a battery case. The positive electrode and the negative electrode each have a structure where an electrode slurry containing an electrode active material is applied on a current collector, which was then dried and rolled to thereby form an active material layer. When an electrode assembly is accommodated in a battery case, an electrolyte solution may be injected into the inside and be sealed to thereby manufacture a battery cell.
- Herein, the current collector may be a positive electrode current collector or a negative electrode current collector, and the electrode active material may be a positive electrode active material or a negative electrode active material. In addition, the electrode slurry may further include a conductive material and a binder in addition to the electrode active material.
- In the present invention, the positive electrode collector generally has a thickness of 3 to 500 micrometers. The positive electrode current collector is not particularly limited as long as it has high conductivity without causing a chemical change in the battery. Examples of the positive electrode current collector include stainless steel, aluminum, nickel, titanium, sintered carbon or aluminum or stainless steel of which the surface has been treated with carbon, nickel, titanium, silver, or the like. The current collector may have fine irregularities on the surface thereof to increase the adhesion of the positive electrode active material, and various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric are possible.
- The sheet for the negative electrode collector generally has a thickness of 3 to 500 micrometers. The negative electrode current collector is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, and examples thereof include copper, stainless steel, aluminum, nickel, titanium, sintered carbon, copper or stainless steel of which the surface has been treated with carbon, nickel, titanium, silver or the like, aluminum-cadmium alloy, or the like. In addition, like the positive electrode current collector, fine unevenness can be formed on the surface to enhance the bonding force of the negative electrode active material, and it can be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.
- In the present invention, the positive electrode active material is a material capable of causing an electrochemical reaction and a lithium transition metal oxide, and contains two or more transition metals. Examples thereof include: layered compounds such as lithium cobalt oxide (LiCoO2) and lithium nickel oxide (LiNiO2) substituted with one or more transition metals; lithium manganese oxide substituted with one or more transition metals; lithium nickel oxide represented by the formula LiNi1-yMyO2 (wherein M=Co, Mn, Al, Cu, Fe, Mg, B, Cr, Zn or Ga and contains at least one of the above elements, 0.01≤y≤0.7); lithium nickel cobalt manganese composite oxide represented by the formula Li1+zNibMncCo1-(b+c+d)MdO(2-e)Ae such as Li1+zNi1/3Co1/3Mn1/3O2, Li1+zNi0.4Mn0.4Co0.2O2 etc. (wherein −0.5≤z≤0.5, 0.1≤b≤0.8, 0.1≤c≤0.8, 0≤d≤0.2, 0≤e≤0.2, b+c+d<1, M=Al, Mg, Cr, Ti, Si or Y, and A=F, P or CO; olivine-based lithium metal phosphate represented by the formula Li1+xM1-yM′yPO4-zXz (wherein M=transition metal, preferably Fe, Mn, Co or Ni, M′=Al, Mg or Ti, X=F, S or N, and −0.5≤x≤0.5, 0≤y≤0.5, 0≤z≤0.1).
- Examples of the negative electrode active material include carbon such as non-graphitized carbon and graphite carbon; metal complex oxide such as LixFe2O3 (0≤x≤1), LixWO2 (0≤x≤1), SnxMe1-xMe′yOz (Me: Mn, Fe, Pb, Ge; Me′: Al, B, P, Si,
groups - The conductive material is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture including the positive electrode active material. Such a conductive material is not particularly limited as long as it has electrical conductivity without causing a chemical change in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; carbon black such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; conductive fibers such as carbon fiber and metal fiber; metal powders such as carbon fluoride, aluminum and nickel powder; conductive whiskey such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; and conductive materials such as polyphenylene derivatives and the like.
- The binder is added in an amount of 1 to 30% by weight, on the basis of the total weight of the mixture containing the positive electrode active material, as a component that assists in bonding between the active material and the conductive material and bonding to the current collector. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.
- Further, the separator is interposed between the positive electrode and the negative electrode, and an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the separator is generally 0.01 to 10 micrometers, and the thickness is generally 5 to 300 micrometers. Examples of such a separator include olefin-based polymers such as polypropylene which is chemically resistant and hydrophobic; a sheet or a nonwoven fabric made of glass fiber, polyethylene or the like.
- In an electrode assembly, an electrode tab is formed at one side of an electrode, and the electrode tab may be a positive electrode tab or a negative electrode tab. A positive electrode lead and a negative electrode lead are connected to the positive electrode tab and the negative electrode tab, respectively. The positive electrode lead and the negative electrode lead are drawn to the outside to thereby play a role of a terminal which is electrically connected to the outside. At this time, the positive electrode lead and the negative electrode lead may be joined to the positive electrode tab and the negative electrode tab, respectively, by welding.
- Further, the battery case is not particularly limited as long as it is used as an exterior material for packaging the battery, and a cylindrical, square, or pouch type may be used and specifically a pouch-type battery case may be used. The pouch-type battery case is generally made of an aluminum laminate sheet and may be composed of an inner sealant layer for sealing, a metal layer for preventing permeation of materials, and an external resin layer forming the outermost part of the case. Details of the battery case are known to those of ordinary skill in the art, and thus detailed description thereof will be omitted.
- In the electrode constituting the electrode assembly, an electrode tab is drawn out to one side for electric connection with an external device or another battery cell. The electrode tab may be a positive electrode tab or a negative electrode tab, and the positive electrode tab and the negative electrode tab may be coupled by the welding with the electrode lead. The electrode lead is drawn to the outside of the battery case.
- On the other hand, in this specification, terms indicating directions such as up, down, left, right, before, and after are used, but it is obvious that these terms are for convenience of description only and may change depending on the location of the object or the location of the observer.
-
-
- 110: electrode lead
- 120: electrode tab
- a, b: diagonal length of welding trace
Claims (9)
1. A method for inspecting a welding quality of an electrode tab-electrode lead welded portion of a pouch-type lithium secondary battery, comprising:
detecting welding traces of the welded portion by a vision inspection device;
measuring a size of each of the recognized welding traces; and
determining whether the welded portion has been weakly welded, excessively welded or normally welded by comparing the measured size with a reference value.
2. The method of claim 1 , wherein the measuring includes measuring a diagonal length of each of the welding traces.
3. The method of claim 1 , wherein the welded portion is welded by an ultrasonic welding or laser welding method.
4. The method of claim 1 , wherein the detecting includes vision-inspecting an electrode lead surface of the welded portion.
5. The method of claim 2 , wherein the measuring includes measuring an area of each of the welding traces.
6. The method of claim 3 , wherein the reference value is obtained from welding quality correlation data according to a pitch of a welding horn.
7. The method of claim 1 , wherein the determining includes determining that the welded portion has been weakly welded if an average value of sizes of the welding traces is smaller than the reference value and determining that the welded portion has been excessively welded if the average value is greater than the reference value.
8. The method of claim 1 , wherein the measuring includes measuring sizes remaining pressure points except for pressure points existing on a first line of each of an upper side, a lower side, a left side and a right side of the welded portion.
9. The method of claim 1 , further comprising inspecting a tensile strength of an object determined as having been normally welded during the determining.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2020-0116258 | 2020-09-10 | ||
KR1020200116258A KR20220033865A (en) | 2020-09-10 | 2020-09-10 | How to inspect the welding quality of electrode tap-lead welds |
PCT/KR2021/007801 WO2022055085A1 (en) | 2020-09-10 | 2021-06-22 | Method for inspecting welding quality of welded portion between electrode tab and lead |
Publications (1)
Publication Number | Publication Date |
---|---|
US20230104232A1 true US20230104232A1 (en) | 2023-04-06 |
Family
ID=80631897
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/801,107 Pending US20230104232A1 (en) | 2020-09-10 | 2021-06-22 | Method for inspecting welding quality of welded portion between electrode tab and lead |
Country Status (6)
Country | Link |
---|---|
US (1) | US20230104232A1 (en) |
EP (1) | EP4089402A4 (en) |
JP (1) | JP2023513810A (en) |
KR (1) | KR20220033865A (en) |
CN (1) | CN115135994A (en) |
WO (1) | WO2022055085A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220311102A1 (en) * | 2021-03-25 | 2022-09-29 | Rivian Ip Holdings, Llc | Systems and methods of battery cell manufacture |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114660360B (en) * | 2022-03-23 | 2022-09-20 | 广东日信高精密科技有限公司 | Lithium battery electrode plate welding resistance testing device |
EP4386362A1 (en) * | 2022-05-13 | 2024-06-19 | Contemporary Amperex Technology Co., Limited | Detection method and detection apparatus for electrode sheet, and stacking system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110686948A (en) * | 2019-10-14 | 2020-01-14 | 河北省建筑科学研究院有限公司 | Method for detecting strength of welding area |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19740024C1 (en) * | 1997-09-11 | 1999-03-11 | Siemens Ag | Method for contact-less testing of weld spots |
JP2000221016A (en) * | 1999-02-02 | 2000-08-11 | Fuji Photo Film Co Ltd | Welding inspection method |
JP3796078B2 (en) * | 1999-10-15 | 2006-07-12 | シャープ株式会社 | Inspection method and inspection device for welded part of interconnector |
JP4983236B2 (en) * | 2006-12-08 | 2012-07-25 | 日産自動車株式会社 | Ultrasonic bonding inspection apparatus, ultrasonic bonding inspection method, ultrasonic bonding apparatus, and ultrasonic bonding method |
JP5470789B2 (en) * | 2007-10-04 | 2014-04-16 | 日産自動車株式会社 | Ultrasonic bonding monitoring apparatus and method |
KR101305255B1 (en) * | 2011-02-23 | 2013-09-06 | 주식회사 엘지화학 | Methode and Device for Inspection of Intensity of Ultrasonic Welding |
JP2013165054A (en) * | 2012-01-12 | 2013-08-22 | Hitachi Maxell Ltd | Battery |
KR101678662B1 (en) | 2013-09-24 | 2016-11-22 | 주식회사 엘지화학 | Method of vision measuring optimization concerning ultrasonic welding state in rechargeable battery and apparatus thereof |
KR101736548B1 (en) * | 2014-11-19 | 2017-05-16 | 주식회사 엘지화학 | Method for welding plural electrode tab and electrode lead of secondary battery and secondary battery using the same, method for inspecting poor welding of secondary battery |
CN109187547A (en) * | 2018-07-23 | 2019-01-11 | 广州超音速自动化科技股份有限公司 | Lithium battery pole ear solder joint welds broken detection method and tab welding detection system |
KR20200116258A (en) | 2019-04-01 | 2020-10-12 | 박훈태 | Method to evaluate a building-based walkability index in urban areas and Web mapping service system and |
-
2020
- 2020-09-10 KR KR1020200116258A patent/KR20220033865A/en unknown
-
2021
- 2021-06-22 CN CN202180016005.1A patent/CN115135994A/en active Pending
- 2021-06-22 WO PCT/KR2021/007801 patent/WO2022055085A1/en unknown
- 2021-06-22 EP EP21866956.2A patent/EP4089402A4/en active Pending
- 2021-06-22 US US17/801,107 patent/US20230104232A1/en active Pending
- 2021-06-22 JP JP2022549185A patent/JP2023513810A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110686948A (en) * | 2019-10-14 | 2020-01-14 | 河北省建筑科学研究院有限公司 | Method for detecting strength of welding area |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220311102A1 (en) * | 2021-03-25 | 2022-09-29 | Rivian Ip Holdings, Llc | Systems and methods of battery cell manufacture |
US11843130B2 (en) * | 2021-03-25 | 2023-12-12 | Rivian Ip Holdings, Llc | Systems and methods of battery cell manufacture |
Also Published As
Publication number | Publication date |
---|---|
EP4089402A4 (en) | 2023-08-09 |
WO2022055085A1 (en) | 2022-03-17 |
JP2023513810A (en) | 2023-04-03 |
CN115135994A (en) | 2022-09-30 |
KR20220033865A (en) | 2022-03-17 |
EP4089402A1 (en) | 2022-11-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20230104232A1 (en) | Method for inspecting welding quality of welded portion between electrode tab and lead | |
KR101305255B1 (en) | Methode and Device for Inspection of Intensity of Ultrasonic Welding | |
EP2899791B1 (en) | Electrode assembly and electrochemical device including same | |
KR102290736B1 (en) | Pressure short testing device for detecting a low voltage battery cell | |
KR20180072065A (en) | Battery Cell and Manufacturing Method thereof | |
KR20220020506A (en) | A system for inspecting a defect in a battery cell and a method for inspecting a defect in a battery cell | |
KR20220118250A (en) | Device and method for detecting damage to monocell type separator | |
JP5716979B2 (en) | Secondary battery inspection method | |
US20230187680A1 (en) | Battery Cell Manufacturing Apparatus Including Rework Automation Equipment and Rework Quantity Counting Method Using the Same | |
KR20140022531A (en) | Electrode assembly and fabricating method of electrochemical cell containing the electrode assembly, electrochemical cell | |
JP7480316B2 (en) | Secondary battery and method for detecting lithium deposition therein | |
EP4095510A1 (en) | Welding defect inspection method | |
KR20220037745A (en) | Methods for safety evaluation of lithium secondary batteries | |
KR20220036067A (en) | 3-electrode battery cell capable of in-situ X-ray analysis | |
KR20200050697A (en) | A Battery cell inspection device capable of continuously performing thickness and insulation voltage measurement | |
EP4033635A1 (en) | Jig for charging/discharging battery cell | |
KR20230057592A (en) | Welding inspection system and methods of welding inspection using eddy current | |
KR20220089487A (en) | Method for managing quality of battery cell and system for managing quality of battery cell | |
KR20220028267A (en) | System for inspecting disconnection of electrode tab and method for inspecting disconnection of electrode tab | |
KR20220045437A (en) | Secondary battery and device including the same | |
KR20220050449A (en) | Method of evaluating the degree of secession of electrode active material | |
CN115602996A (en) | Method for manufacturing separator of lithium secondary battery and lithium secondary battery including separator | |
KR20220053192A (en) | Method of evaluating the degree of secession of electrode active material | |
KR20220060837A (en) | Method of evaluating the degree of secession of electrode active material | |
KR20230054102A (en) | Electrode State Analysis Device And Analysis Method Using It |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: LG ENERGY SOLUTION, LTD., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BAE, SANG HO;JUNG, HUN BUM;CHOI, JAE HWA;AND OTHERS;SIGNING DATES FROM 20220603 TO 20220607;REEL/FRAME:061295/0430 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |